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What is the appropriate volume for playing prenatal education music on a mobile phone?

After repeated tests by prenatal education experts, it has been confirmed that the most suitable prenatal education music playback volume for fetuses is below 60dB and the audio frequency is within 2000Hz. It is difficult for expectant mothers to master such precise volume by themselves, so they need to choose special prenatal education music playback equipment, such as music prenatal education equipment. It is recommended that the prenatal education equipment chosen should have a volume control function.